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99 Yukon SLT fuel gauge is not reading correct. on 1999 GMC Yukon

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
I have gone about 240 miles and it is reading between 1/2 and 3/4 tank I know that's not correct. Then sometimes it will start to work. What would cause this?
(1) Answer
(4) Comments
Possible tank sender or gauge problem.... Scan test needed to confirm!.... NOT a code read at a parts store... A SCAN TEST! The scanner is capable of sweeping gauges to test!!!
Where could I get that scan test done? Also that 1/2 tank to 3/4 tank is on the full side.
I can't say, I'm in VA and prices vary, you may be able to just have the instrumentation tested and save a few bucks. Call around to find out! In any case it's cheaper than guessing...wrong!!